Malicious PDF — malware analysis report

Static analysis result for SHA-256 c037d31083788580…

MALICIOUS

PDF

78.8 KB Created: 2021-02-14 13:23:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 257c97b1cec73b934d43bc0e33b7f622 SHA-1: 7031727b1f78a68ec871a20c5f0ad619f0d8649f SHA-256: c037d31083788580afba23fcdca02072439f3bc13fdd16a6656ed6bc766c21e2
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or phish users. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/123?utm_term=2001+arctic+cat+250+manual In PDF document text
    • https://funujitumim.weebly.com/uploads/1/3/5/3/135347265/1602077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393188/normal_6027429a276ee.pdfIn PDF document text
    • https://badosajag.weebly.com/uploads/1/3/1/4/131407507/b471a.pdfIn PDF document text
    • https://kelulove.weebly.com/uploads/1/3/0/7/130775366/ed6b9c.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/lulejabopu_bisavopusoviju_kujum.pdfIn PDF document text
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/6148140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402740/normal_5fd6eed3233c1.pdfIn PDF document text
    • https://mosodufenu.weebly.com/uploads/1/3/4/8/134889918/wezazekaran_dapukiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404745/normal_60080c33c8e52.pdfIn PDF document text
    • https://wijununag.weebly.com/uploads/1/3/1/4/131438003/e172372425f574.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/19995593058.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/keburuzujopiwos.pdfIn PDF document text
    • http://pitupeg.epizy.com/ivy_global_sat_2_hr_diagnostic_answers.pdfIn PDF document text
    • http://zunijakokusageg.epizy.com/berare.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/wedaxoxewizikideve.pdfIn PDF document text
    • http://tikikenuf.epizy.com/50782932623.pdfIn PDF document text
    • http://zorogeloma.epizy.com/clown_knife_fish_care_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/haverhill_police_department_accident_report.pdfIn PDF document text
    • http://muwumatenenuli.rf.gd/nc_dmv_accident_report_codes.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 5124 bytes
SHA-256: 17245ac24ffb181f5616e8306851d5a91bffef76886d6f93f3eb4b51ba731796
font_01_sfnt_off0001087c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 11052 bytes
SHA-256: 082df154bd55387787d7962a018b9ca2c09aa822fd32fae9703bdc5a2e426c18

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